tools/testing/selftests/bpf/verifier/perf_event_sample_period.c

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/bpf/verifier/perf_event_sample_period.c

Extension

.c

Size

1677 bytes

Lines

60

Domain

Support Tooling And Documentation

Bucket

tools

Inferred role

Support Tooling And Documentation: implementation source

Status

source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

{
	"check bpf_perf_event_data->sample_period byte load permitted",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_0, 0),
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1,
		    offsetof(struct bpf_perf_event_data, sample_period)),
#else
	BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_1,
		    offsetof(struct bpf_perf_event_data, sample_period) + 7),
#endif
	BPF_EXIT_INSN(),
	},
	.result = ACCEPT,
	.prog_type = BPF_PROG_TYPE_PERF_EVENT,
},
{
	"check bpf_perf_event_data->sample_period half load permitted",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_0, 0),
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	BPF_LDX_MEM(BPF_H, BPF_REG_0, BPF_REG_1,
		    offsetof(struct bpf_perf_event_data, sample_period)),
#else
	BPF_LDX_MEM(BPF_H, BPF_REG_0, BPF_REG_1,
		    offsetof(struct bpf_perf_event_data, sample_period) + 6),
#endif
	BPF_EXIT_INSN(),
	},
	.result = ACCEPT,
	.prog_type = BPF_PROG_TYPE_PERF_EVENT,
},
{
	"check bpf_perf_event_data->sample_period word load permitted",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_0, 0),
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
		    offsetof(struct bpf_perf_event_data, sample_period)),
#else
	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
		    offsetof(struct bpf_perf_event_data, sample_period) + 4),
#endif
	BPF_EXIT_INSN(),
	},
	.result = ACCEPT,
	.prog_type = BPF_PROG_TYPE_PERF_EVENT,
},
{
	"check bpf_perf_event_data->sample_period dword load permitted",
	.insns = {
	BPF_MOV64_IMM(BPF_REG_0, 0),
	BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1,
		    offsetof(struct bpf_perf_event_data, sample_period)),
	BPF_EXIT_INSN(),
	},
	.result = ACCEPT,
	.prog_type = BPF_PROG_TYPE_PERF_EVENT,
},

Annotation

• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.